I've connected the integrated graphics up to HDMI on my TV since my actual display uses DP, it works!
On top of that I used the 'Load Video BIOS' thing as well as the MacPro3,1 SMBIOS and the overrides "dart=0 -x -v IGPEnabler=yes"

Update: I have installed both the Nvidia Alternate Drivers and the post-installation of Multi-Beast but now it won't boot unless it's in safe mode, other wise this error will appear:

It happens both with and without the GTX 970... How do I get the hackintosh boot without going into Safe Mode?